ANAHEIM, Calif. (AP)  The California Highway Patrol says all westbound lanes of State Route 91 in Anaheim are closed following a crash involving multiple vehicles including a big rig.

CHP Officer Jon Latosquin says no information about possible injuries is immediately available following the crash before dawn Wednesday on the major Orange County route. He says no fatalities have been reported.

Several vehicles were involved, including a big rig, but Latosquin did not know the exact number.

Commuter traffic is backed up for miles. Motorists are being diverted to State Route 57.